Hornberg Castle was probably originally built in the late 12th century. The first mention of the castle dates from 1184. In 1259 lords of Hornberg sold the castle to the bishop of Speyer. Since 1612 it has been owned by the 12th generations of Gemmingen barons. Today the castle is a hotel.
Hornberg originally consisted of two separate castles. Between them was a bailey. Around 1510, both castles were enclosed together with the a common wall as an additional attachment of Conz Schott of Schottenstein.
The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.